Updated r_screenoverlay command to accept '0' as well as 'off' to disable overlays. This fixes some community mods that were incorrectly expecting 0 to disable the overlay, resulting in unexpected behavior.

Added "Reset All Achievements" button to the Achievements dialog

A small number of achievements are based on player stats and will be awarded again when Team Fortress 2 is restarted unless the player stats are also reset

Resetting achievements will not allow you to receive achievement-based items multiple times

Players who consistently demonstrate a pattern of negative behavior in-game (based upon excessive reports from other players and several other factors) will now receive a temporary matchmaking ban